Product Overview
When vibration monitoring systems fail unexpectedly, costly downtime and equipment damage follow. The Bently Nevada 990-10-50-02-00 Vibration Transmitter provides robust, continuous protection with a built-in NOT OK/signal defeat feature that quickly alerts operators to sensor faults. This industrial automation module accepts one non-contacting 3300 NSv Proximity Probe and delivers a 4-20 mA output proportional to vibration amplitude. With its compact design and versatile mounting options, the 990-10-50-02-00 integrates seamlessly into existing condition monitoring systems.
Technical Specifications
The 990-10-50-02-00 offers precise measurement capabilities across key parameters:
| Parameter |
Value |
| Input |
Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable |
| Power Requirement |
+12 to +35 Vdc at transmitter terminal |
| Output Signal |
4 to 20 mAdc over full-scale range (2-wire) |
| Loop Accuracy |
±1.5% over full-scale range (excluding probe scale factor) |
| Frequency Response |
5 Hz to 6,000 Hz +0, -3 dB |
| Maximum Loop Resistance |
1,000 Ω including cable at 35 Vdc |
| Current Limiting |
23 mA typical |
| NOT OK/Signal Defeat |
Output <3.6 mA within 100 µs; restores in 2-3 seconds |
| Probe Gap Range |
0.5 to 1.75 mm (20 to 55 mils) |
| Minimum Target Size |
9.5 mm (0.375 in) diameter |
| Weight |
0.43 kg (0.9 lb) |
Installation and Setup
Mount the Bently Nevada 990-10-50-02-00 using bulkhead screws (Mounting Option 02). Ensure the mating probe is properly gapped between 0.5 and 1.75 mm from the target to achieve full-scale range. Use a maximum cable length of 3 meters (10 feet) for the Proximitor Sensor Output (BNC). Connect power (+12 to +35 Vdc) and the 4-20 mA loop observing the 1,000 Ω maximum loop resistance. Non-interacting zero and span adjustments allow fine-tuning without cross-effects. For hazardous environments, a 28 V power supply is recommended for Zone 2 or Div 2 locations.
Troubleshooting and Common Issues
A common failure mode in vibration transmitters is loss of signal due to probe damage or cable faults. The Bently Nevada 990-10-50-02-00 addresses this with its NOT OK/signal defeat feature: within 100 µs of a detected fault, the output drops below 3.6 mA, immediately signaling a problem to the monitoring system. If the loop current exceeds 23 mA, the internal current limiting protects the transmitter and loop components. Always verify loop resistance does not exceed 1,000 Ω at 35 Vdc to maintain accuracy. Frequent recalibration may be avoided due to the ±1.5% accuracy specification, but periodic gap checks ensure reliable operation.
Selection Guide and Purchasing Advice
When ordering the Bently Nevada 990-10-50-02-00, confirm your full-scale range (0-10 mils pp or 0-250 μm pp) and system length (5.0 meters standard). Agency approval option 00 covers non-hazardous locations—select appropriate options for hazardous areas. As a trusted supplier, ubest101 stocks this exact model and can provide compatible probes and cables. Ensure your control system accepts a 4-20 mA input and can interpret the NOT OK fault signal. For demanding industrial environments, this transmitter offers reliable, long-term condition monitoring.